# Friends of 20 Dominoes

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\$0.99 or Free on Plus | 4 pages (PDF)|Grade: 1

A set of dominoes to use in the classroom when matching friends of 20.

Use this teaching resource during numeracy group activities to help students identify the different number combinations that make 20.

Print, cut and laminate a class set of the dominoes and store in a zip-loc bag.

Individually, or in small groups, students connect the dominoes by matching two numbers that make 20. For example, 2 + 18, 5+ 15, 16 +4.

#### Common Core Curriculum alignment

• CCSS.MATH.CONTENT.1.OA.C.6

Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 - 4 = 13 - 3 - 1 = 10 - ...

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